Speaker
Description
Presentation demonstrates the results of measurements of the plasma boundary velocity during the compression of a metallic gas-puff Z pinch in an axial magnetic field. The experiment was conducted on the IMRI-5 facility (current pulse of 450-kA amplitude with a 450-ns rise time); the initial magnetic field Bz0 was varied in the range 0.15–0.6 T. The trajectories of radius vs time were constructed using two independent methods. First is well known technique: it is determination of an “inductance radius” rind using the dependence of the pinch inductance vs time. Second is a new techniques: it is using the B-dot probes for the determination of current sheath motion. The data obtained with the B-dot probes agree with the results obtained by other methods (optical imaging and determination of the pinch radius as a function of the time-varying pinch inductance L(t)). It is shown that the plasma compression velocity is (1–1.5)×107 cm/s at the implosion without the field Bz and 0.6×107 cm/s at at the implosion with Bz = 0.6T.
Work supported by the grant of the Russian Foundation for Basic Research (grant No.17-08-00131-а and No.15-08-03845-а).
